Stock, Sina
Mohamed, Salah A.
Sievers, Hans-Hinrich
Article History
Received: 24 May 2017
Accepted: 22 August 2017
First Online: 30 August 2017
Compliance with ethical standards
:
: Hans-Hinrich Sievers receive royalties from B. Braun Melsungen (Germany) for Sinus prosthesis.